mwg API
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    Interface TerrainImage

    One image a matched rule places, at an offset from the rule's own anchor cell.

    interface TerrainImage {
        dx?: number;
        dy?: number;
        image: string;
        layer?: number;
    }
    Index
    dx?: number

    offset from the anchor cell, in the same pixel/cell unit the caller draws with

    dy?: number
    image: string
    layer?: number

    draw order among a rule's own images and other rules matching the same cell; higher draws later (on top)